Could a simple dollar bill be worth thousands? It’s true! Keep an eye out for ones with really low numbers, like 00000001, ones with really high numbers, ones with repeating number patterns like 12341234, ones that only use the same two numbers like 12212122, and flippers – ones that have a number that can be read the same even if it is upside-down, like 00069000. According to TikToker The_Coin_Guy on TikTok , these bills are selling for thousands.